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1da177e4 LT |
1 | /* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */ |
2 | #ifndef __SPARC64_CHECKSUM_H | |
3 | #define __SPARC64_CHECKSUM_H | |
4 | ||
5 | /* checksum.h: IP/UDP/TCP checksum routines on the V9. | |
6 | * | |
7 | * Copyright(C) 1995 Linus Torvalds | |
8 | * Copyright(C) 1995 Miguel de Icaza | |
9 | * Copyright(C) 1996 David S. Miller | |
10 | * Copyright(C) 1996 Eddie C. Dost | |
11 | * Copyright(C) 1997 Jakub Jelinek | |
12 | * | |
13 | * derived from: | |
14 | * Alpha checksum c-code | |
15 | * ix86 inline assembly | |
16 | * RFC1071 Computing the Internet Checksum | |
17 | */ | |
18 | ||
19 | #include <linux/in6.h> | |
20 | #include <asm/uaccess.h> | |
21 | ||
22 | /* computes the checksum of a memory block at buff, length len, | |
23 | * and adds in "sum" (32-bit) | |
24 | * | |
25 | * returns a 32-bit number suitable for feeding into itself | |
26 | * or csum_tcpudp_magic | |
27 | * | |
28 | * this function must be called with even lengths, except | |
29 | * for the last fragment, which may be odd | |
30 | * | |
31 | * it's best to have buff aligned on a 32-bit boundary | |
32 | */ | |
d5c63936 | 33 | extern __wsum csum_partial(const void * buff, int len, __wsum sum); |
1da177e4 LT |
34 | |
35 | /* the same as csum_partial, but copies from user space while it | |
36 | * checksums | |
37 | * | |
38 | * here even more important to align src and dst on a 32-bit (or even | |
39 | * better 64-bit) boundary | |
40 | */ | |
d5c63936 AV |
41 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
42 | int len, __wsum sum); | |
43 | ||
44 | extern long __csum_partial_copy_from_user(const void __user *src, | |
45 | void *dst, int len, | |
46 | __wsum sum); | |
47 | ||
48 | static inline __wsum | |
49 | csum_partial_copy_from_user(const void __user *src, | |
50 | void *dst, int len, | |
51 | __wsum sum, int *err) | |
1da177e4 LT |
52 | { |
53 | long ret = __csum_partial_copy_from_user(src, dst, len, sum); | |
54 | if (ret < 0) | |
55 | *err = -EFAULT; | |
d5c63936 | 56 | return (__force __wsum) ret; |
1da177e4 LT |
57 | } |
58 | ||
59 | /* | |
60 | * Copy and checksum to user | |
61 | */ | |
62 | #define HAVE_CSUM_COPY_USER | |
d5c63936 AV |
63 | extern long __csum_partial_copy_to_user(const void *src, |
64 | void __user *dst, int len, | |
65 | __wsum sum); | |
66 | ||
67 | static inline __wsum | |
68 | csum_and_copy_to_user(const void *src, | |
69 | void __user *dst, int len, | |
70 | __wsum sum, int *err) | |
1da177e4 LT |
71 | { |
72 | long ret = __csum_partial_copy_to_user(src, dst, len, sum); | |
73 | if (ret < 0) | |
74 | *err = -EFAULT; | |
d5c63936 | 75 | return (__force __wsum) ret; |
1da177e4 LT |
76 | } |
77 | ||
78 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned | |
79 | * the majority of the time. | |
80 | */ | |
d5c63936 | 81 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
82 | |
83 | /* Fold a partial checksum without adding pseudo headers. */ | |
d5c63936 | 84 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
85 | { |
86 | unsigned int tmp; | |
87 | ||
88 | __asm__ __volatile__( | |
89 | " addcc %0, %1, %1\n" | |
90 | " srl %1, 16, %1\n" | |
91 | " addc %1, %%g0, %1\n" | |
92 | " xnor %%g0, %1, %0\n" | |
93 | : "=&r" (sum), "=r" (tmp) | |
d5c63936 | 94 | : "0" (sum), "1" ((__force u32)sum<<16) |
1da177e4 | 95 | : "cc"); |
d5c63936 | 96 | return (__force __sum16)sum; |
1da177e4 LT |
97 | } |
98 | ||
d5c63936 | 99 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
1da177e4 LT |
100 | unsigned int len, |
101 | unsigned short proto, | |
d5c63936 | 102 | __wsum sum) |
1da177e4 LT |
103 | { |
104 | __asm__ __volatile__( | |
105 | " addcc %1, %0, %0\n" | |
106 | " addccc %2, %0, %0\n" | |
107 | " addccc %3, %0, %0\n" | |
108 | " addc %0, %%g0, %0\n" | |
109 | : "=r" (sum), "=r" (saddr) | |
d5c63936 | 110 | : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr) |
1da177e4 LT |
111 | : "cc"); |
112 | return sum; | |
113 | } | |
114 | ||
115 | /* | |
116 | * computes the checksum of the TCP/UDP pseudo-header | |
117 | * returns a 16-bit checksum, already complemented | |
118 | */ | |
d5c63936 | 119 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
1da177e4 LT |
120 | unsigned short len, |
121 | unsigned short proto, | |
d5c63936 | 122 | __wsum sum) |
1da177e4 LT |
123 | { |
124 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
125 | } | |
126 | ||
127 | #define _HAVE_ARCH_IPV6_CSUM | |
128 | ||
d5c63936 AV |
129 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
130 | const struct in6_addr *daddr, | |
131 | __u32 len, unsigned short proto, | |
132 | __wsum sum) | |
1da177e4 LT |
133 | { |
134 | __asm__ __volatile__ ( | |
135 | " addcc %3, %4, %%g7\n" | |
136 | " addccc %5, %%g7, %%g7\n" | |
137 | " lduw [%2 + 0x0c], %%g2\n" | |
138 | " lduw [%2 + 0x08], %%g3\n" | |
139 | " addccc %%g2, %%g7, %%g7\n" | |
140 | " lduw [%2 + 0x04], %%g2\n" | |
141 | " addccc %%g3, %%g7, %%g7\n" | |
142 | " lduw [%2 + 0x00], %%g3\n" | |
143 | " addccc %%g2, %%g7, %%g7\n" | |
144 | " lduw [%1 + 0x0c], %%g2\n" | |
145 | " addccc %%g3, %%g7, %%g7\n" | |
146 | " lduw [%1 + 0x08], %%g3\n" | |
147 | " addccc %%g2, %%g7, %%g7\n" | |
148 | " lduw [%1 + 0x04], %%g2\n" | |
149 | " addccc %%g3, %%g7, %%g7\n" | |
150 | " lduw [%1 + 0x00], %%g3\n" | |
151 | " addccc %%g2, %%g7, %%g7\n" | |
152 | " addccc %%g3, %%g7, %0\n" | |
153 | " addc 0, %0, %0\n" | |
154 | : "=&r" (sum) | |
155 | : "r" (saddr), "r" (daddr), "r"(htonl(len)), | |
156 | "r"(htonl(proto)), "r"(sum) | |
157 | : "g2", "g3", "g7", "cc"); | |
158 | ||
159 | return csum_fold(sum); | |
160 | } | |
161 | ||
162 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | |
d5c63936 | 163 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
1da177e4 LT |
164 | { |
165 | return csum_fold(csum_partial(buff, len, 0)); | |
166 | } | |
167 | ||
168 | #endif /* !(__SPARC64_CHECKSUM_H) */ |